A US official who ordered the closure of lanes on a congested bridge in New Jersey last September has claimed that Governor Chris Christie was aware of the move at the time. Mr Christie has repeatedly said he first learned of the closure last month.
New Jersey Governor Chris Christie said he has fired a top aide "because she lied to me".
Christie said the termination of Bridget Kelly's employment was "effective immediately".
Kelly had been Christie's deputy chief of staff for legislative and intergovernmental affairs.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.